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- The key difference between primary and secondary memory is that primary memory can be directly accessed by the CPU whereas, the CPU can not directly access the secondary memory.
- The primary memory of the computer is also known as the main memory of the computer. However, secondary memory is known as auxiliary memory.
- The data that is to be currently processed is in primary memory whereas, the data that has to be permanently stored is kept in secondary memory.
- Primary memory is a volatile memory whereas, the secondary memory is a non-volatile memory.
- Primary memories are semiconductor memories whereas; the secondary memories are the magnetic and optical memories.
- Data accessing speed of the primary memory is faster than secondary memory.
- Primary memory is accessed by the data bus. On the other hand, secondary memory is accessed using input-output channels.
- Primary memory’s capacity is always smaller than secondary memory’s capacity.
- Primary memory is costlier than secondary memory.
- Primary memory is an internal memory whereas, secondary memory is an external memory.
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